Biomechanical comparison of a notched head locking T-Plate and a straight locking compression plate in a Juxta-Articular fracture model

Bird, G., Glyde, M., Hosgood, G., Hayes, A. and Day, R. (2020) Biomechanical comparison of a notched head locking T-Plate and a straight locking compression plate in a Juxta-Articular fracture model. Veterinary and Comparative Orthopaedics and Traumatology .

Abstract

Objective: This investigation compared the biomechanical properties of a 2.0 mm locking compression notched head T-plate (NHTP) and 2.0 mm straight locking compression plate (LCP), in a simple transverse juxta-articular fracture model.

Study Design: Two different screw configurations were compared for the NHTP and LCP, modelling short (configuration 1) and long working length (configuration 2). Constructs were tested in compression, perpendicular and tension non-destructive four point bending and torsion. Plate surface strain was measured at 12 regions of interest (ROI) using three-dimensional digital image correlation. Stiffness and strain were compared between screw configurations within and between each plate.

Results: The LCP was stiffer than the NHTP in all three planes of bending and torsion (p < 0.05). The NHTP had greater strain than the LCP during compression bending and torsion at all ROI (p < 0.0005). The short working length was stiffer in all three planes of bending and in torsion (p < 0.05) than the longer working length for both plates. The long working length showed greater strain than the short working length at most ROI.

Conclusion: In this experimental model, a 2.0 mm LCP with two screws in the short fragment was significantly stiffer and had lower plate strain than a 2.0 mm NHTP with three screws in the short fragment. Extending the working length significantly reduced construct stiffness and increased plate strain. These findings may guide construct selection.

Item Type:	Journal Article
Murdoch Affiliation(s):	Veterinary Medicine
Publisher:	Schattauer
Copyright:	© 2020 Georg Thieme Verlag KG
URI:	http://researchrepository.murdoch.edu.au/id/eprint/59061

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